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There is not. Anyone that says there is is lyingggggg .
Too many variables.
There is always going to be build up even if you have a neck cleaner
Pumps reguardless of their setting can and will push a little more or a little less water resulting in level change.
Sump level can also change. Ie. failure
You’ll always have to end up doing some sort or cleaning/ tuning - weekly/ monthly
I’ve had both over my 20+ years and even now on my current 700g I have to adjust it. It’s a external fed by a water blaster pump and a regal Octopus
I tend to agree. Not to mention small changes in water viscosity make a big difference too.

was to nuke a cup of RO/DI water once a week and put the airline into the cup of water and suck the hot water through the venturi once a week. Flushed it out quite nicely.

